JP2016049588A - Chuck device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chuck device capable of gripping a thickness-different work, without requiring a preparatory plan change.SOLUTION: A chuck device comprises an outer cylindrical body 1 and a collet 10. The collet 10 comprises four claw parts 12 and four movable claw parts 20. The respective claw parts 12 are provided at an interval in the circumferential direction on an inside surface of a tip part of the collet 10. The respective movable claw parts 20 are provided in a plurality of claw parts 12, and project to the inside more than the inside surface of these claw parts 12. The respective movable claw parts 20 reciprocatably move in the axial direction of the collet 10 between a gripping position and a standby position on the innermost side than this gripping position. This chuck device advances-retreats in the axial direction of the outer cylindrical body 1 in a state of inserting the collet 10 from an opening part of the outer cylindrical body 1, so that the claw parts 12 and the movable claw parts 20 reciprocatably move in the radial direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a chuck device.

  Patent Document 1 discloses a conventional chuck device. The chuck device includes a chuck body and an operation member having a claw portion attached to the front end. The chuck body has a rear plate and a front plate connected via a connecting member, and a drive member that is housed in a space between the rear plate and the front plate and moves forward and backward along the axis of the chuck body. doing. The front plate is provided with three inclined holes. These inclined holes are provided at equal intervals on concentric circles of the central axis of the chuck body. These inclined holes are gradually inclined outward from the rear to the front. The operating member is snugly fitted into the inclined hole and connected to the drive member. For this reason, when the drive member advances and retreats along the axis of the chuck body, the operating member reciprocates in the direction in which the inclined hole extends. The claw portion is held by the inner surface abutting against the outer surface of the workpiece. In this chuck device, the claw portion reciprocates in the radial direction of the chuck body as the operating member advances and retreats in the inclined hole. For this reason, this chuck | zipper apparatus can hold | grip a workpiece | work with a nail | claw part, or can cancel | release a holding | grip.

JP 2012-218117 A

  However, when gripping a workpiece having a different thickness, the chuck device disclosed in Patent Document 1 must replace the claw portion attached to the front end of the operation member with one that matches the thickness of the workpiece. As described above, this chuck device needs to be replaced, for example, to replace the claw portion every time it tries to grip a workpiece having a different thickness.

  The present invention has been made in view of the above-described conventional situation, and it is an object to be solved to provide a chuck device that can grip a workpiece having a different thickness without requiring setup change.

  The chuck device of the present invention includes an outer cylinder and a collet. The collet has a plurality of claw portions and a plurality of moving claw portions. Each nail | claw part is provided in the inner surface of the front-end | tip part of a collet at intervals in the circumferential direction. Each moving nail | claw part is provided in the some nail | claw part, and protrudes inward rather than the inner surface of these nail | claw parts. Each moving claw part reciprocates in the axial direction of the collet between the gripping position and the standby position at the back of the gripping position. In this chuck device, the claw portion and the moving claw portion reciprocate in the radial direction by moving back and forth in the axial direction of the outer cylinder while the collet is inserted from the opening of the outer cylinder.

  When the moving claw is moved inward in the radial direction in a state where the moving claw is positioned at the gripping position, the chuck device has an inner surface of the moving claw on the outer surface of the work inserted in the insertion space inside the moving claw. The work is gripped by the contact of the side surfaces. Further, in this chuck device, when the claw portion moves inward in the radial direction with the moving claw portion positioned at the moving position, the inner surface of the claw portion is placed on the outer side surface of the work inserted in the insertion space inside the collet. Hold the workpiece by contact.

  As described above, the chuck device can grip a work thinner than the insertion space inside the inner side surface of each moving claw portion with a plurality of moving claw portions positioned at the gripping position. In addition, this chuck device can move the moving claw portion from the gripping position to the standby position and grip it by a plurality of claw portions with respect to a workpiece thicker than the insertion space inside the inner surface of each moving claw portion. .

  Therefore, the chuck device of the present invention does not require setup change and can grip workpieces having different thicknesses.

  In the chuck device of the present invention, the moving claw portion may have a groove portion extending in the axial direction on the outer surface and closed on the back side, and the claw portion may have a stopper member into which the tip portion is inserted into the groove portion. In this case, when the moving claw portion moves from the standby position to the gripping position, the tip of the stopper member comes into contact with the back end portion where the groove portion is closed. For this reason, this chuck device can prevent the moving claw portion from jumping forward from the gripping position.

  The chuck device of the present invention can include an extruding member that advances and retreats in the axial direction on the central axis of the outer cylinder and pushes out the workpiece inserted inside the collet. The moving claw can be moved from the gripping position to the standby position by the work inserted into the insertion space, and can be moved from the standby position to the gripping position by being pushed by the pushing member that pushes out the work. In this case, since the chuck device reciprocates the moving claw portion by moving the workpiece and the pushing member, the structure can be simplified.

  In the chuck device of the present invention, the claw portion may include a claw portion main body and a guide portion that is provided continuously behind the claw portion main body and guides the moving claw portion to the standby position. In this case, in this chuck device, the moving claw can smoothly reciprocate between the gripping position and the standby position.

  In the chuck device of the present invention, the collet may have a plurality of sets of moving claw portions having different protruding widths protruding inward from the inner side surface of the claw portion. In this case, the thickness of the workpiece | work which can be hold | gripped with this chuck | zipper apparatus for every movement nail | claw part from which protrusion width differs differs. For this reason, in this chuck apparatus, there are a plurality of types of workpiece thicknesses that can be gripped by the claw portion and workpiece thicknesses that can be gripped by the moving claw portion. That is, this chuck device can grip a workpiece having three or more different thicknesses.

It is a front view which shows the collet of the chuck device of Embodiment 1. It is arrow XX sectional drawing of FIG. FIG. 3 is an enlarged exploded view of a main part of FIG. 2. It is sectional drawing which shows the state in which the movement nail | claw part of the chuck apparatus of Embodiment 1 hold | grips a workpiece | work. It is sectional drawing corresponding to FIG. 2 which showed the state in which the movement nail | claw part of the chuck apparatus of Embodiment 1 hold | grips a workpiece | work. It is sectional drawing which shows the state in which the nail | claw part of the chuck apparatus of Embodiment 1 hold | grips a workpiece | work. It is sectional drawing corresponding to FIG. 2 which showed the state which the nail | claw part of the chuck apparatus of Embodiment 1 hold | grips a workpiece | work. It is a front view which shows the nail | claw part to which 2 sets of moving claw parts were attached.

  Next, a first embodiment in which the chuck device of the present invention is embodied will be described with reference to the drawings.

<Embodiment 1>
The chuck apparatus of Embodiment 1 is provided with the outer cylinder 1, the collet 10, the drive member 30, the extrusion member 50, and the stop member 70, as shown in FIG.1 and FIG.2. As shown in FIG. 2, the outer cylinder 1 has a substantially cylindrical shape. The outer cylindrical body 1 is inclined so that the inner peripheral surface 1A of the tip portion gradually decreases in diameter from the tip toward the back direction (in FIG. 2, from the right end to the left).

  As shown in FIGS. 1 and 2, the collet 10 includes a collet body 11, a claw portion 12, and a moving claw portion 20. The collet body 11 is substantially cylindrical. The collet body 11 is provided with four elliptical side holes 11A extending in the axial direction at substantially central portions of the side parts at equal intervals in the circumferential direction (see FIG. 2). Further, the collet body 11 is provided with four slits 11B extending from each side hole 11A to the tip of the collet body 11 (the end located on the right side in FIG. 2) at equal intervals in the circumferential direction. These slits 11 </ b> B are opened in the radial direction from the central axis of the collet body 11. As described above, the collet body 11 is formed by four divided side surface portions 14 that are equally divided from the side surface holes 11A at the front. Further, as shown in FIG. 2, the collet body 11 is inclined so that the outer peripheral surface 14A of the tip end portion (the front side of the divided side face portion 14) gradually increases in diameter toward the tip end. The axial inclination angle of the inner peripheral surface 1A of the distal end portion of the outer cylinder 1 and the axial inclination angle of the outer peripheral surface 14A of the outer peripheral surface 14A of the collet body 11 are the same. For this reason, the collet body 11 has the outer cylindrical body 1 through the opening 2 of the outer cylindrical body 1 so that the outer peripheral surface 14A inclined at the distal end is in contact with the inclined inner peripheral surface 1A at the distal end of the outer cylindrical body 1. Has been inserted inside. Further, as shown in FIGS. 2 and 3, the collet body 11 is formed such that the inner peripheral surface of the distal end portion (the front side of the divided side surface portion 14) is the first inner peripheral surface 14B having a larger diameter on the distal end side. The side is formed by a second inner peripheral surface 14C having a smaller diameter than the first inner peripheral surface 14B. Further, the collet body 11 has a female thread portion 11C formed on the inner peripheral surface of the rear end portion.

  As shown in FIGS. 1 to 3, one claw portion 12 is attached to each of the inner side surfaces 14 </ b> A and 14 </ b> B of each divided side surface portion 14 of the collet body 11. Each nail | claw part 12 is the shape which extended the front-end | tip part (front side of each division | segmentation side part 14) of the collet main body 11 to the center axis direction. That is, each nail | claw part 12 is continuously provided in the back of the nail | claw part main body 15 and the nail | claw part main body 15 attached to the 1st internal peripheral surface 14B of the collet main body 11, and the 2nd of the collet main body 11 is provided. And a guide portion 16 continuously attached to the inner peripheral surface 14C. The claw portion 12 is screwed to the collet body 11 by a bolt B that passes through a through-hole 12C that penetrates the claw body 15 in the front-rear direction.

  The outer surface 15A of the claw body 15 is an arcuate curved surface centered on the central axis of the collet body 11, and is in contact with the first inner peripheral surface 14B without a gap. The outer surface 16A of the guide portion 16 is an arcuate curved surface centering on the central axis of the collet body 11, and is in contact with the second inner peripheral surface 14C without a gap. Inner side surfaces (inner side surfaces of the claw portion 12) 12 </ b> A of the claw portion main body 15 and the guide portion 16 are formed on the same surface, and are arcuate curved surfaces centering on the central axis of the collet main body 11. The front end face of the claw part main body 15 (front end face of the claw part 12) is disposed on the same plane as the front end face of the collet main body 11. The rear end surface of the guide portion 16 (the rear end surface of the claw portion 12) is disposed on the same plane as the rear end surface of the second inner peripheral surface 14C of the collet body 11.

  The left and right side surfaces (left and right side surfaces of the claw portion 12) 12B of the claw portion main body 15 and the guide portion 16 are continuous with the slits 11B of the respective divided side surface portions 14 of the collet main body 11, and extend radially from the central axis of the collet main body 11. It is spreading. That is, the four claw portions 12 have gaps (gap formed by extending the slits 11 </ b> B of the collet body 11 in the central axis direction) opened in the radial direction from the central axis of the collet body 11 therebetween. . As described above, the collet 10 is provided with the four claw portions 12 on the inner surface of the tip portion with a space in the circumferential direction.

  The claw portion 12 has a locking groove portion 17 extending in the axial direction at the center portion in the circumferential direction of the inner side surface 12A. The locking groove portion 17 is formed of a curved surface whose bottom surface extends in parallel with the inner side surface 12A of the claw portion 12. That is, the bottom surface of the locking groove portion 17 is an arcuate curved surface centering on the central axis of the collet body 11. The locking groove portion 17 has a locking portion 17A that protrudes inwardly on the opening side of the opposite side surface (inner side surface side of the claw portion 12). The claw portion 12 has a screw hole 12 </ b> D that penetrates from the outer surface 15 </ b> A of the claw portion main body 15 to the central portion in the circumferential direction of the locking groove portion 17. Further, the claw portion 12 has a pin plunger 18 screwed into the screw hole 12D. 3, the pin plunger 18 is housed in the shaft member 18A, the ball 18B fitted to the tip of the shaft member 18A, and the shaft member 18A, and urges the ball 18B in the tip direction (not shown). And a spring member.

  The moving claw portion 20 has the outer surface 20 </ b> A side inserted into the locking groove portion 17 of the claw portion 12, and the inner side surface 20 </ b> B side protrudes inward from the inner side surface 12 </ b> A of the claw portion 12. The inner side surface 20 </ b> B of the moving claw 20 is an arcuate curved surface with the central axis of the collet body 11 as the center. The moving claw portion 20 is formed with the same curved surface as the bottom surface of the locking groove portion 17 so that the outer surface 20A slides on the bottom surface of the locking groove portion 17. The moving claw portion 20 is a convex portion 20C in which the left and right side surfaces on the outer surface 20A side protrude in the left-right direction. The convex portion 20 </ b> C is engaged with the engaging portion 17 </ b> A of the engaging groove portion 17 of the claw portion 12. For this reason, the moving claw portion 20 does not disengage from the locking groove portion 17 toward the center axis side of the collet 10, and the front end portion is a claw portion from a gripping position where the front end portion is substantially flush with the front end portion of the collet body 11. It is possible to reciprocate to a standby position located inside the vicinity of the boundary between the 12 claw body 15 and the guide 16.

  The moving claw portion 20 has a groove portion 21 extending from the front end surface in the axial direction of the collet 10 to the vicinity of the central portion in the axial direction on the outer surface 20A and closed on the back side. A ball 18B at the tip of the pin plunger 18 is inserted into the groove 21. Since the elastic force of the spring member of the pin plunger 18 is urged in the direction of the central axis of the collet 10 in the moving claw portion 20, the convex portions 20 </ b> C provided on the left and right side surfaces on the outer surface 20 </ b> A side are engaged with the claw portion 12. It will be in the state pressed against the latching | locking part 17A of the stop groove part 17. FIG. Further, the moving claw portion 20 can prevent the ball 18B at the tip end portion of the pin plunger 18 from abutting against the closed end portion 21B closed by the groove portion 21 and thereby jumping forward from the gripping position described later.

  As shown in FIG. 2, the collet body 11 has a drive member 30 inserted inward from the rear end. The collet body 11 is connected to the drive member 30 by screwing a male screw portion 30 </ b> A formed on the outer peripheral surface of the drive member 30 into a female screw portion 11 </ b> C formed on the inner peripheral surface of the rear end portion. The drive member 30 advances and retreats in the outer cylinder in the axial direction. For this reason, as the drive member 30 advances and retracts in the axial direction, the connected collet body 11 also advances and retracts in the axial direction. When the collet main body 11 advances and retreats in the axial direction, the outer peripheral surface 14A of the tip end portion of the collet main body 11 slides on the inner peripheral surface 1A of the tip end portion of the outer cylinder 1, and the claw portion 12 and the moving claw portion 20 are moved to the collet main body 11. Reciprocate in the radial direction. The inside of the claw portion 12 than the inner side surface 12A is an insertion space for inserting a workpiece.

  The extrusion member 50 has an extrusion shaft portion 51 and an extrusion head portion 52. The extrusion shaft portion 51 has a cylindrical shape, and passes through the drive member 30 and the central portion of the collet 10. The extrusion shaft portion 51 advances and retracts in the axial direction. The extrusion head 52 is connected to the front end of the extrusion shaft portion 51. For this reason, the extrusion head 52 also advances and retreats in the axial direction. As shown in FIGS. 2 and 3, the extrusion head 52 has a front part 52A, an intermediate part 52B, and a rear part 52C. The front portion 52A of the extrusion head 52 has a substantially cylindrical shape. The intermediate portion 52B of the extrusion head 52 is continuous to the rear of the front portion 52A and has a slightly larger outer diameter than the front portion 52A. The front end surface 53 of the intermediate portion 52B of the pushing head 52 abuts on the inner peripheral surface side of the rear end surface 20D of the moving claw portion 20. The rear portion 52C of the extrusion head 52 is continuous to the rear of the intermediate portion 52B and has a larger outer shape than the intermediate portion 52B. The rear portion 52C of the extrusion head 52 is provided with three concave portions 54 on the outer peripheral surface at equal intervals in the circumferential direction. The front side of the concave portion 54 is closed by an upright surface 54A, and is released in the radial direction and the rear side. For this reason, a distal end portion 70A of a stop member 70 described later is inserted into the recess 54 from the rear.

  The stop member 70 is substantially cylindrical. The stop member 70 has a rear end portion 70 </ b> B fixed to an intermediate portion of the outer cylindrical body 1, the driving member 30 is inserted into the outer cylindrical body 1, and a front end portion 70 </ b> A is inserted into the recessed portion 54. The stop member 70 is attached to the outer cylinder 1 corresponding to each recess 54.

  As for the extrusion head 52, the front part 52A is located inside the moving claw part 20 in the insertion space of the collet 10 at the forward movement position, and the front end part projects slightly forward from the front end surfaces of the collet body 11 and the claw part 12. . Further, as shown in FIGS. 5 and 7, the extruding head 52 is in the retracted position, the front end surface 71 of the stop member 70 abuts on the rising surface 54A of the recess 54 provided in the rear portion 52C of the extruding head 52, The front end moves backward to the vicinity of the boundary between the claw body 15 and the guide 16.

  In the chuck device having such a configuration, as shown in FIG. 2, before the workpiece is gripped, the pushing member 50 is moved to the advance position. At this time, the front end surface 53 of the intermediate portion 52B of the pushing head 52 is in contact with the inner peripheral surface side of the rear end surface 20D of the moving claw portion 20. That is, the moving claw portion 20 is pushed by the pushing member 50 and moved to the gripping position.

  When this chuck device grips a cylindrical workpiece W1 thinner than the insertion space inside the inner surface of each moving claw portion 20, the extrusion head 52 of the extrusion member 50 moves backward as shown in FIGS. When the workpiece W1 is retracted to the position and the workpiece W1 is inserted into the insertion space of the collet 10, the moving claw portion 20 remains in the gripping position. That is, the chuck device retracts the drive member 30 in the axial direction in a state where the moving claw portion 20 is positioned at the gripping position. Then, the collet body 11 is also retracted in the axial direction, and the moving claw portion 20 moves inward in the radial direction. And the inner surface 20B of the moving claw part 20 can contact | abut to the outer surface of the workpiece | work W1, and can hold | grip the workpiece | work W1.

  Further, when the chuck device grips a cylindrical workpiece W2 that is thicker than the insertion space inside the inner side surface of each moving claw portion 20, as shown in FIGS. When the workpiece 52 is retracted to the retracted position and the workpiece W2 is inserted into the insertion space of the collet 10, the tip surface of the workpiece W2 comes into contact with the front end surface 20E of the movable claw portion 20 and grips the movable claw portion 20. Move from the position to the standby position. That is, in the chuck device, the driving member 30 is retracted in the axial direction with the moving claw 20 moved to the standby position. Then, the collet body 11 is also retracted in the axial direction, and the claw portion 12 moves inward in the radial direction. And the inner surface 12A of the claw part 12 can contact | abut the outer surface of the workpiece | work W2, and can hold | grip the workpiece | work W2.

  In addition, when releasing the gripping of the workpieces W1 and W2, the chuck device moves the claw portion 12 and the moving claw portion 20 outward in the radial direction when the drive member 30 advances in the axial direction as shown in FIG. Moving. Then, the inner side surface 20B of the moving claw portion 20 or the inner side surface 12A of the claw portion 12 is separated from the outer side surfaces of the workpieces W1 and W2 to release the grip. Then, when the pushing head 52 of the pushing member 50 moves forward to the advance position, the workpieces W1 and W2 are pushed out from the insertion space, and the front end surface 53 of the intermediate portion 52B of the pushing head 52 is moved behind the moving claw 20. Since the end face 20D is in contact with the inner peripheral surface side, the moving claw portion 20 moves to the gripping position. At this time, since the ball 18B at the tip of the pin plunger 18 abuts on the closed back end 21B of the groove 21 on the outer surface 20A of the moving claw 20, the moving claw 20 jumps forward from the gripping position. Can be prevented.

  As described above, the chuck device includes the outer cylinder 1 and the collet 10, and the collet 10 includes the four claw portions 12 and the four moving claw portions 20. Each nail | claw part 12 is attached to the inner surface of the front-end | tip part of the collet 10 at intervals in the circumferential direction. Each moving claw portion 20 is attached to each claw portion 12 and protrudes inward from the inner surface of these claw portions 12. Each moving claw portion 20 reciprocates in the axial direction of the collet 10 between a gripping position and a standby position on the back side of the gripping position. In this chuck device, the claw portion 12 and the moving claw portion 20 reciprocate in the radial direction by advancing and retracting in the axial direction of the outer cylinder 1 with the collet 10 inserted from the opening of the outer cylinder 1. .

  This chuck device moves to the outer surface of the workpiece W1 inserted into the insertion space inside the moving claw 20 when the moving claw 20 moves inward in the radial direction with the moving claw 20 positioned at the gripping position. The inner surface 20B of the claw portion 20 comes into contact with and grips the workpiece W1. Further, in this chuck device, when the claw portion 12 moves inward in the radial direction with the moving claw portion 20 moved to the movement position, the claw portion is formed on the outer surface of the work W2 inserted into the insertion space inside the collet 10. The inner surface 12A of 12 contacts and grips the workpiece W2.

  As described above, the chuck device can grip the workpiece W1 thinner than the insertion space inside the inner side surface 20B of each moving claw portion 20 by the plurality of moving claw portions 20 positioned at the gripping position. Further, the chuck device moves the moving claw portion 20 from the gripping position to the standby position with respect to the workpiece W2, which is thicker than the insertion space inside the inner side surface 20B of each moving claw portion 20, and the plurality of claw portions 12 It can be gripped.

  Therefore, the chuck device of Embodiment 1 does not require setup change and can grip workpieces having different thicknesses.

  Further, in this chuck device, the moving claw portion 20 has a groove portion 21 extending in the axial direction on the outer surface 20A and closed on the back side, and the claw portion 12 has a pin plunger 18 into which a ball 18B at the tip portion is inserted into the groove portion 21. have. In this case, in the checking device, when the moving claw portion 20 moves from the standby position to the gripping position, the ball 18 at the tip end portion of the pin plunger 18 abuts on the back side end portion 21B where the groove portion 21 is closed. For this reason, this chuck device can prevent the moving claw portion 20 from jumping forward from the gripping position.

  Further, the chuck device includes an extruding member 50 that moves forward and backward in the axial direction on the central axis of the outer cylinder 1 and pushes out the workpieces W1 and W2 inserted inside the collet 10. The moving claw portion 20 is pushed by the workpiece W2 inserted into the insertion space to move from the gripping position to the standby position, and is pushed by the pushing member 50 that pushes out the workpiece W2 to move from the standby position to the gripping position. For this reason, since this chuck device reciprocates the moving claw portion 20 by the movement of the workpiece W2 and the movement of the pushing member 50, the structure can be simplified.

  Further, in this chuck device, the claw portion 12 has a claw portion main body 15 and a guide portion 16 for guiding the moving claw portion 20 to the standby position. Therefore, in this chuck device, the moving claw portion 20 can smoothly reciprocate between the gripping position and the standby position.

The present invention is not limited to the first embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first embodiment, one moving claw portion is attached to one claw portion. However, as shown in FIG. Alternatively, two sets of moving claw portions 110 and 120 having different protruding widths protruding inward may be attached. In this case, since the thickness of the work that can be gripped for each of the moving claw portions 110 and 120 having different projecting widths is different in this chuck device, the thickness of the work that can be gripped by the claw portion 100 and the others. There are two types of workpiece thicknesses that can be gripped by the moving claw portions 110 and 120. Further, the moving claw portions 110 and 120 prevent the pin plunger 18 from jumping forward from the gripping position. That is, this chuck device can grip three types of workpieces. As described above, if a plurality of sets of moving claw portions having different projecting widths protruding inward from the inner surface of the claw portion are attached to one claw portion, there are three types of workpiece thicknesses that can be gripped. This can be done.

(2) In Embodiment 1, the moving claw portion is attached to the claw portion, but the second moving claw further has an inner surface that protrudes inward from the inner surface of the moving claw portion with respect to the moving claw portion. A part may be attached. If it does in this way, the thickness of the work which can be grasped can be made into three kinds. Furthermore, if the moving claw part is attached in a plurality of stages so that the projecting width protruding inwardly increases, the thickness of the work that can be gripped can be increased to three or more.

(3) In the first embodiment, the inner surface of the claw portion and the moving claw portion is an arcuate curved surface so as to come into contact with the outer peripheral surface of the cylindrical workpiece, but the claw portion is formed according to the outer shape of the workpiece to be gripped. And you may change the shape of the inner surface of a movement nail | claw part.

(4) In the first embodiment, the claw portion and the moving claw portion are moved inward in the radial direction when the collet is retracted in the axial direction. However, when the collet advances in the axial direction, the claw portion and the moving claw portion are moved. The chuck device may be applied so as to move inward in the radial direction.

(5) In Embodiment 1, four claw portions and moving claw portions are arranged in the circumferential direction of the collet. However, the number of claw portions and moving claw portions may be three, or five or more. Further, the number of the claw portions and the moving claw portions may not be the same.

(6) Although the claw part formed separately from the collet body is screwed to the collet body in the first embodiment, the collet body and the claw part may be integrally formed.

  DESCRIPTION OF SYMBOLS 1 ... Outer cylinder body, 10 ... Collet, 12 ... Claw part, 12A ... Inner side surface (of claw part), 15 ... Claw part main body, 16 ... Guide part, 18 ... Pin plunger (stopper member), 20 ... Moving claw part 20A ... outer surface (of moving claw part), 21 ... groove, 50 ... extruded member, W1, W2 ... workpiece,

Claims (5)

An outer cylinder,
A plurality of claw portions that are provided on the inner side surface of the distal end portion with a circumferential interval and that hold the inner side surface against the outer side surface of the workpiece inserted into the inner insertion space, and are provided on the plurality of claw portions. Projecting inward from the inner side surface of these claw portions, reciprocally move in the axial direction between the gripping position and the standby position at the back of the gripping position, and inserted into the insertion space at the gripping position A moving claw portion that holds the inner side surface in contact with the outer side surface of the workpiece, and moves forward and backward in the axial direction of the outer cylinder body while being inserted from the opening of the outer cylinder body. A collet in which the part and the moving claw part reciprocate in the radial direction;
A chuck device comprising: The moving claw part has a groove part extending in the axial direction of the collet on the outer side surface and closed on the back side,
The chuck device according to claim 1, wherein the claw portion has a stopper member into which a tip portion is inserted into the groove portion. Advancing and retreating on the central axis of the outer cylinder in the axial direction, comprising an extrusion member that pushes out the workpiece inserted into the insertion space
The moving claw portion is pushed by the workpiece inserted into the insertion space to move from the gripping position to the standby position, and is pushed by the push-out member that pushes out the workpiece to move from the standby position to the gripping position. The chuck device according to claim 1, wherein:   The claw part includes a claw part main body and a guide part that is provided continuously behind the claw part main body and guides the moving claw part to the standby position. The chuck device according to any one of claims 1 to 3.   5. The chuck device according to claim 1, wherein the collet has a plurality of sets of the moving claw portions having different protrusion widths protruding inward from an inner surface of the claw portion. .

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